Both of them can be found right here.
Here's one I had in my shop earlier this year that my mom found for me while visiting my sister in Illinois. She fought for this one and some more at an auction (she did good!):
Here's a history:
L’Aiglon was founded in 1919 in Philadelphia as part of Biberman Brothers, Inc. The company’s original label read “Biberman Make” but changed in 1919 to “L’Aiglon”. On those early labels you will find “Biberman Make” in small letters. Biberman Make dresses were “wash dresses”, or washable. “Tubable” was the word of the era. Biberman also made bathrobes and uniforms for maids and nurses.
Its founder, Joseph Biberman, committed suicide in 1933 as a result of financial difficulties during the Great Depression. The company, however, survived, and continued to make inexpensive but stylish and attractive dresses for women and juniors. During the 1950s, L’Aiglon dresses were used as costumes on the soap opera, The Edge of Night. The company produced dresses until about 1968.
~~~~I would *Love* to find a piece with the "Biberman Make" tag!~~~~
To date your L'Aiglon dress look to the Vintage Fashion Guild that lists the various L'Aiglon tags by decade.